Within Auto Measurement Mode, the HDC302x maintains a history of the maximum and minimum measurement for temperature and relative humidity (described as variables MIN T, MAX T, MIN RH, and MAX RH). This feature is useful for scenarios where the user would like to assess if the ambient conditions ever approached, but did not surpass, the defined environmental thresholds as documented in Section 220.127.116.11.1. Table 8-4 summarizes the status of MIN T, MAX T, MIN RH, and MAX RH based on device configuration.
|HDC302x Configuration||MIN T||MAX T||MIN RH||MAX RH|
|Outside of Auto Measurement Mode||130°C||-45°C||100%||0%|
|Within Auto Measurement Mode||Monitored and Latched When Appropriate|
Whenever the HDC302x exits Auto Measurement Mode (for example, through Auto Measurement Mode: Exit, Soft Reset, General Call Reset, or ), all four variables will return to their default values documented in Table 8-4. Therefore, measurement history readouts outside of Auto Measurement Mode are invalid. Figure 8-20, Figure 8-21, Figure 8-22, and Figure 8-23 illustrate the I2C sequence for measurement readout of MIN T, MAX T, MIN RH, and MAX RH.